This document discusses rangelands and factors that define grasslands. It begins by defining rangelands as vast natural landscapes dominated by grasslands, shrublands, woodlands, wetlands, and deserts. It then describes different types of rangelands around the world based on climate and vegetation. Several key factors that determine grasslands are discussed, including climate, soil properties, and disturbance from fire and grazing. The effects of defoliation on plants are also summarized.